Saturday and Sunday on TV

Saturday

Horse racing (3 p.m., Ch. 5): The Preakness

NBA playoffs: Heat at Pacers (6 p.m., TNT); Spurs at Lakers (8:30 p.m., TNT)

Harry Potter and the Sorcerer's Stone (7 p.m., Ch. 4): ABC airs this for the second time in six days.

28 Days Later (9 p.m., HBO): Scary and really gory 2002 horror flick. (Rated R)

Sunday

NBA playoffs: Timberwolves at Kings (1:30 p.m., Ch. 4); Pistons at Nets (6 p.m., TNT)

The True Story of Troy (6 p.m., History): Well, as true as possible, given that Troy was destroyed thousands of years ago.

King of the Hill (6:30 p.m., Ch. 13): Kahn gives up and embraces the redneck lifestyle.

Helter Skelter (7 p.m., Ch. 2): Three-hour TV movie that recounts how Charles Manson was able to persuade others to commit murders for him.

Extreme Makeover: Home Edition (7 p.m., Ch. 4): Rebuilding a home infested with potentially deadly mold.

The Simpsons (7 p.m., Ch. 13): Bart and the rest of the family are deemed un-American.

Charmed (7 p.m., Ch. 30): Leo is sucked into an evil universe.

Las Vegas Live (7 p.m., Bravo): A look at the who/what/where/when of the gambling mecca.

Super Millionaire (8 p.m., Ch. 4): Regis Philbin kicks off another five-day run for this $10 million version of the game.

Law & Order: CI (8 p.m., Ch. 5): Somebody is killing elderly patients.

The Practice (9 p.m., Ch. 4): Bobby Donnell (Dylan McDermott) returns as the firm breaks up and the series ends.

Crossing Jordan (9 p.m., Ch. 5): Jordan and Devan disagree again.

The Sopranos (10 p.m., HBO): Tony is obsessed with an old flame.